Investigations into conductivity, photoconductivity and photoresponse of the vacuum evaporated cadmium sulfide (CdS) films have been carried out. Evaporated tin-nickel alloy is used for making ohmic contacts. Changes in the electrical properties of the system due to heat treatment of the thin-film samples are ascribed to changes in the contact resistance and the accompanying change in the surface recombination velocity at the metal-photoconductor interface. The rise and decay times of photoresponse of CdS films have been determined and the viability of the films in fabrication of a photodevice ascertained.
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